Fio blog post on test coverage

[Vincent Fu <vincentfu@xxxxxxxxx>]

I am happy to announce that the fio blog has a new post. I surveyed 
fio's options and summarize test coverage in our automated tests. How 
many of fio's options are protected by automated regression testing?

Take a look:

https://github.com/vincentkfu/fio-blog/wiki/fio-test-coverage

Feedback is welcome!

Vincent